FFMPEG scale down image -


this ffmpeg gurus!

i have video take screenshot image of. works fine:

ffmpeg -i sourcemovie.mp4 -ss 0 -vframes 1 destimage.jpg

but hoping scale down image 150 px wide, in 1 fell swoop. apparently, should add 

scale=150:-1

but , how insert in command?

i have tried everything; nothing works ...

scale videofilter, use "-vf":

ffmpeg -i sourcemovie.mp4 -ss 0 -vframes 1 -vf "scale=150:-1" destimage.jpg

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